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15254 %ymm registers not restored after signal handler
15367 x86 getfpregs() summons corrupting %xmm ghosts
15333 want x86 /proc xregs support (libc_db, libproc, mdb, etc.)
15336 want libc functions for extended ucontext_t
15334 want ps_lwphandle-specific reg routines
15328 FPU_CW_INIT mistreats reserved bit
15335 i86pc fpu_subr.c isn't really platform-specific
15332 setcontext(2) isn't actually noreturn
15331 need <sys/stdalign.h>
Change-Id: I7060aa86042dfb989f77fc3323c065ea2eafa9ad
Conflicts:
usr/src/uts/common/fs/proc/prcontrol.c
usr/src/uts/intel/os/archdep.c
usr/src/uts/intel/sys/ucontext.h
usr/src/uts/intel/syscall/getcontext.c
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--- old/usr/src/lib/libc/i386/sys/getcontext.S
+++ new/usr/src/lib/libc/i386/sys/getcontext.S
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
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17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 24 * Use is subject to license terms.
25 25 */
26 26
27 +/*
28 + * Copyright 2023 Oxide Computer Company
29 + */
30 +
27 31 .file "getcontext.s"
28 32
29 33 #include <sys/asm_linkage.h>
30 34
31 35 ANSI_PRAGMA_WEAK(getcontext,function)
32 36 ANSI_PRAGMA_WEAK(swapcontext,function)
33 37
34 38 #include "SYS.h"
35 39 #include <assym.h>
36 40
37 41 /*
38 42 * getcontext() and swapcontext() are written in assembler since it has to
39 43 * capture the correct machine state of the caller, including
40 44 * the registers: %edi, %esi and %ebx.
41 45 *
42 46 * As swapcontext() is actually equivalent to getcontext() + setcontext(),
43 47 * swapcontext() shares the most code with getcontext().
44 48 */
45 49
46 50
47 -#define GETCONTEXT_IMPL \
51 +#define GETCONTEXT_IMPL(func) \
48 52 movl 4(%esp), %eax; /* %eax <-- first arg: ucp */ \
49 53 pushl %eax; /* push ucp for system call */ \
50 - call __getcontext; /* call getcontext: syscall */ \
54 + call func; /* call getcontext: syscall */ \
51 55 addl $4, %esp; /* pop arg */ \
52 56 andl %eax, %eax; /* if (err_ret_from_syscall) */ \
53 57 je 1f; \
54 58 ret; /* then return */ \
55 59 1: \
56 60 movl 4(%esp), %eax; /* recompute first arg */ \
57 61 /* \
58 62 * fix up %esp and %eip \
59 63 */ \
60 64 leal UC_MCONTEXT_GREGS (%eax), %edx; \
61 65 /* %edx <-- &ucp->uc_mcontext.gregs */ \
62 66 movl 0(%esp), %eax; /* read return PC from stack */ \
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63 67 movl %eax, EIP_OFF (%edx); \
64 68 /* store ret PC in EIP of env var */ \
65 69 leal 4(%esp), %eax; /* get caller's sp at time of call */ \
66 70 movl %eax, UESP_OFF (%edx); \
67 71 /* store the sp into UESP of env var */ \
68 72 xorl %eax, %eax; /* return 0 */ \
69 73 movl %eax, EAX_OFF (%edx); \
70 74 /* getcontext returns 0 after a setcontext */
71 75
72 76 /*
73 - * getcontext(ucontext_t *ucp)
77 + * int getcontext(ucontext_t *ucp)
74 78 */
75 79 ENTRY(getcontext)
76 - GETCONTEXT_IMPL
80 + GETCONTEXT_IMPL(__getcontext)
77 81 ret
78 82 SET_SIZE(getcontext)
79 83
80 84
81 85 /*
82 - * swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
86 + * int swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
83 87 */
84 88 ENTRY(swapcontext)
85 - GETCONTEXT_IMPL
86 - / call setcontext
89 + GETCONTEXT_IMPL(__getcontext)
90 + /* call setcontext */
87 91 movl 8(%esp), %eax /* %eax <-- second arg: ucp */
88 92 pushl %eax /* push ucp for setcontext */
89 93 call setcontext
90 94 addl $4, %esp /* pop arg: just in case */
91 95 ret
92 96 SET_SIZE(swapcontext)
97 +
98 +/*
99 + * int getcontext_extd(ucontext_t *ucp, uint32_t flags)
100 + */
101 + ENTRY(getcontext_extd)
102 + movl 8(%esp), %eax
103 + cmpl $0, %eax /* if (flags != 0) */
104 + jne 2f
105 + GETCONTEXT_IMPL(__getcontext_extd)
106 + ret
107 +2:
108 + movl $EINVAL, %eax /* errno = EINVAL; */
109 + jmp __cerror /* return (-1) */
110 + SET_SIZE(getcontext_extd)
111 +
112 +
113 +/*
114 + * int swapcontext_extd(ucontext_t *oucp, const ucontext_t *ucp)
115 + */
116 + ENTRY(swapcontext_extd)
117 + movl 8(%esp), %eax
118 + cmpl $0, %eax /* if (flags != 0) */
119 + jne 2f
120 + GETCONTEXT_IMPL(__getcontext_extd)
121 + /* call setcontext */
122 + movl 12(%esp), %eax /* %eax <-- second arg: ucp */
123 + pushl %eax /* push ucp for setcontext */
124 + call setcontext
125 + addl $4, %esp /* pop arg: just in case */
126 + ret
127 +2:
128 + movl $EINVAL, %eax /* errno = EINVAL; */
129 + jmp __cerror /* return (-1) */
130 + SET_SIZE(swapcontext_extd)
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